Frederick horne



(No Model.)

P. HORNE.

MEANS FOR THE PREVENTION OF GONDENS ATION 0N WINDOWS No. 507,731. Patented Oct. 31, 1893.

I UNrrE STATES .ATENT Enron.

FREDERICK HORNE, OF WILMSLOW, ENGLAND.

MEANS FOR THE PREVENTION OF CONDENSATION 0N WINDOWS.

SPECIFICATION forming part of Letters Patent No. 507,731, dated October 31, 1893. Application filed June 20, 1893. serial'llm478l257. (No model.)

.To all whom, it may concern.-

Be it known that I, FREDERICK HORNE, a subject of the Queen of Great Britain and Ireland, residing at Wilmslow, in the county of Chester, England, have invented Improved Means for the Prevention of Condensation on Windows, of which the following is a specification.

The condensation of moisture upon Windows, causes considerable inconvenience and loss, and this is more especially the case with shop windows, not only on account of-the View of articles exhibited for sale being intercepted or in very cold weather entirely hidden by the windows becoming frosted, but also goods of various descriptions are in many cases irretrievably damaged by coming into contact with the moisture on the glass. This condensation (as is well known) is caused by the warm moist atmosphere of the room or shop coming into contact with the cold glass of the window, causing it to gradually part with its moisture which becomes condensed upon the glass and in cold weather frozen thereon.

The object of my invention is to entirely prevent this condensation and frosting (or to remove the same if already formed) which I propose to eifect by passing a continuous column of heated air over the interior surface of the window.

- The manner in which my said invention is to be performed or carried into practical effect will be readily understood on reference to the sheet of drawings hereunto annexed and the following explanation thereof.

The drawings represent, for the sake of illustration the application of my invention in the case where gas is used as a source of heat for warming the air but other sources of heat may also be employed (as hereinafter explained) for the purposes of my invention.

Figure 1 on thedrawings represents in elevation part of a shop or other window as seen from the inside with my invention shown as applied thereto. Fig. 2 is a vertical section and Fig. 3 a horizontal section of the same.

a is part of the window frame and b is the ordinary window glass.

On the inside of the window I place a second sheet of glass 0 preferably thin and sep arated from the existing glass of the window by a space of from two to three inches and (when gas or lamps are employed as a source of heat) extending to about two inches from the bottom of the outside sheet. If hot air pipes are used, then the glass can extend to the bottom of outside sheet. If hot water pipes are employed, then the glass can extend to one inch from the bottom of outside sheet.

In the space between the two sheets of glass at the bottom of the window, I fix a gas pipe (1 fitted with burners equidistant (say two and .a quarter inches) along its entire length (those burners known as Brays patent answer very well) and also a band 6 of wire gauze (or other suitable material) bent in such a manner as to inclose the flame, thereby causing a greater quantity of air to be mixed with the gas, and producing a greater. heat, with less consumption of gas; but if desirable to utilize the gas for illuminating purposes, then the gauze can be dispensed with. If hot air be available, then I pass a pipe or pipes from the apparatus (in the place of the gas pipe d) and having pierced the same at intervals, allow a sufficient quantity of hot air to pass upward between the two sheets of glass 11 and c. If hot water be the source desired to give the heat necessary, then a pipe or pipes of such form and capacity, as are found most convenient, to the particular trade, can be used. If in country places, lamps are the only means available then I should adopt such lamps as would give a wide flame parallel to the window.

The inside sheet of glass 0 may vary in width, a piece six inches wide being sufficient (under ordinary conditions as to draft, &c.) to maintain from two feet six inches to three feet of the window perfectly clear of condensation. This would generally be equal to the line of sight of a man of medium height, standing on the pathway outside. The second or inner sheet of glass 0 is preferably so adapted to the frame of the window, with buttons or other fastenings f, or hinged or otherwise so arranged that it can readily be removed for cleaning or other purposes when required.

The continuous current of heated air passing up between the two glasses 1) and 0 will cause the inner one to be kept at a temperature above that of the shop or room, and also will so effectually ventilate that section immediately inside the window glass proper as in itself to prevent moisture in the air of the shop or room from coming into contact with 5 or condensing upon it, and frosting cannot then occur. If such does form during the night or during cessation of using the improved means a very few minutes will sufficc to evaporate all, and the window will be [0 left clear and bright as a mirror. This improved means is almost imperceptible to persons outside.

I claim as my invention- The improved means for the prevention of i5 condensation on Windows consisting in the FREDERICK HORNE.

\Vitnesscs:

GEORGE DAvIEs, J NO. HUGHES. 

